<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>京东轮播图</title>
    <script src="jquery-3.4.1.js"></script>
    <style>
        * {
            margin: 0;
            padding: 0;
            list-style: none;
        }
        .slider {
            height: 340px;
            width: 790px;
            margin: 100px auto;
            position: relative;
        }
        .slider li {
            position: absolute;
            display: none;
        }
        .slider li:first-child {
            display: block;
        }
        .arrow {
            display: none;
        }
        .slider:hover .arrow {
            display: block;
        }
        .arrow-left,
        .arrow-right {
            font-family: "SimSun", "宋体";
            width: 30px;
            height: 60px;
            background-color: rgba(0, 0, 0, 0.1);
            position: absolute;
            top: 50%;
            margin-top: -30px;
            cursor: pointer;
            text-align: center;
            line-height: 60px;
            color: #fff;
            font-weight: 700;
            font-size: 30px;
        }
        .arrow-left:hover,
        .arrow-right:hover {
            background-color: rgba(0, 0, 0, .5);
        }
        .arrow-left {
            left: 0;
        }
        .arrow-right {
            right: 0;
        }
    </style>
    <script>
        $(function () {
            let count=0;
            $(".arrow-right").click(function () {
                count++;
                if(count==$(".slider li").length){
                    count=0;
                }
                //fadein fadeout 淡入淡出效果 eq从0开始
                $(".slider li").eq(count).fadeIn().siblings("li").fadeOut();
            });
        $(".arrow-left").click(function () {
            count--;
            if(count==-1){
                count=$(".slider li").length-1;
            }
            $(".slider li").eq(count).fadeIn().siblings("li").fadeOut();

        })
        });
    </script>
</head>
<body>
<div class="slider">
    <ul>
        <li><a href="#"><img src="images/1.jpg" alt=""></a></li>
        <li><a href="#"><img src="images/2.jpg" alt=""></a></li>
        <li><a href="#"><img src="images/3.jpg" alt=""></a></li>
        <li><a href="#"><img src="images/4.jpg" alt=""></a></li>
        <li><a href="#"><img src="images/5.jpg" alt=""></a></li>
        <li><a href="#"><img src="images/6.jpg" alt=""></a></li>
        <li><a href="#"><img src="images/7.jpg" alt=""></a></li>
        <li><a href="#"><img src="images/8.jpg" alt=""></a></li>
    </ul>
    <div class="arrow">
        <span class="arrow-left">&lt;</span>
        <span class="arrow-right">&gt;</span>
    </div>
</div>
</body>
</html>